优化工单模块，增加企微模块

sg_wechat_enterprise/we_api/session/__init__.py

@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+from __future__ import absolute_import, unicode_literals
+
+
+class SessionStorage(object):
+
+    def get(self, key, default=None):
+        raise NotImplementedError()
+
+    def set(self, key, value, ttl=None):
+        raise NotImplementedError()
+
+    def delete(self, key):
+        raise NotImplementedError()
+
+    def __getitem__(self, key):
+        self.get(key)
+
+    def __setitem__(self, key, value):
+        self.set(key, value)
+
+    def __delitem__(self, key):
+        self.delete(key)